Question

найдите сумму многочленов 2х^2+х-1 и х^2-3х

Answer 1

$2x^2+x-1 + x^2-3x = 0 \ 3x^2-2x-1=0 \ x= frac{2+- sqrt{(-2)^2-4*3(-1)} }{2 * 3} = frac{2 +-sqrt{4+12} }{6} = frac{2 +-sqrt{16} }{6}\ x_1 = 1 \ x_2 = - frac{1}{3}$